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One common laboratory technique - the use of circularly polarized light in circular dichroic spectroscopy - optically records changes in protein secondary structure to study the dynamics within the biological system.

Visual pigments, the molecules in photoreceptors that initiate the process of vision, are inherently dichroic, differentially absorbing light according to its axis of polarization.

The angle between the diglucosamine ring plane and the membrane plane was determined by dichroic measurements using polarized IR light with oriented multilayers of the endotoxins.